X-Git-Url: https://git.sesse.net/?p=stockfish;a=blobdiff_plain;f=src%2Fmovepick.h;h=5896bbefab9e9d0c3876fc44942d41cc8c393d4e;hp=44fc51f6263d73ca5a88919ff044e3e6b256cc12;hb=b2edac7075ca238326378cb2c5ef09f7cdb2fd9e;hpb=2e86d1febc163e076320a6a21060fc5a1c7c0dff diff --git a/src/movepick.h b/src/movepick.h index 44fc51f6..5896bbef 100644 --- a/src/movepick.h +++ b/src/movepick.h @@ -30,14 +30,13 @@ /// The Stats struct stores moves statistics. According to the template parameter -/// the class can store History, Gains and Countermoves. History records how often +/// the class can store History and Countermoves. History records how often /// different moves have been successful or unsuccessful during the current search -/// and is used for reduction and move ordering decisions. Gains records the move's -/// best evaluation gain from one ply to the next and is used for pruning decisions. +/// and is used for reduction and move ordering decisions. /// Countermoves store the move that refute a previous one. Entries are stored /// using only the moving piece and destination square, hence two moves with /// different origin but same destination and piece will be considered identical. -template +template struct Stats { static const Value Max = Value(250); @@ -54,21 +53,17 @@ struct Stats { void update(Piece pc, Square to, Value v) { - if (Gain) - table[pc][to] = std::max(v, table[pc][to] - 1); - - else if (abs(table[pc][to] + v) < Max) - table[pc][to] += v; + if (abs(table[pc][to] + v) < Max) + table[pc][to] += v; } private: T table[PIECE_NB][SQUARE_NB]; }; -typedef Stats< true, Value> GainsStats; -typedef Stats HistoryStats; -typedef Stats MovesStats; -typedef Stats CounterMovesHistoryStats; +typedef Stats HistoryStats; +typedef Stats MovesStats; +typedef Stats CounterMovesHistoryStats; /// MovePicker class is used to pick one pseudo legal move at a time from the